Trouble with images in Editor

I had been successfully uploading images (icons, photos, etc.) in the Editor until today, when I started receiving the error message, "The extension is invalid. Please get a new instance of the extension from the extension framework. For reference, the Error ID is addeb309-5ee0-40aa-97fc-6d466f70c3ff." This happens whether I select an image from my computer or from my Course Content. Has anyone encountered this issue? Thank you for any help you might be able to offer!